如何在 Angular Subsink 中處理兩個 api 調用？

Question

我正在angular subsink內進行 api 調用，如下所示：

import {SubSink} from 'subsink';
...
...
async clickButton() {
    for (let i = 0; i < this.Id.length; i++) {
        const hostId = await this.serviceA.Status(this.hostName[i]);
        this.subs.sink = this.serviceB.createDbEntry(hostId))
            .subscribe(s => {
                if (i === this.Id.length - 1) {
                    this.dialog.close();
                }
            });
    }
}

這里this.Id是any類型

現在我想在成功完成this.serviceB.createDbEntry(hostId)后進行另一個 api 調用，並且我通過添加另一個subs.subsink來做到這subs.subsink ，如下所示：

import {SubSink} from 'subsink';
...
...
async clickButton() {
    for (let i = 0; i < this.Id.length; i++) {
        const hostId = await this.serviceA.Status(this.hostName[i]);
        this.subs.sink = this.serviceB.createDbEntry(hostId))
            .subscribe(s => {
                if (i === this.Id.length - 1) {
                    this.dialog.close();
                }
            });
        this.subs.sink = this.serviceC.runRetry(hostId))
            .subscribe(s => {
                if (i === thisserverId.length - 1) {
                    this.dialog.close();
                }
            });             
    }
}

這是在this.serviceB.createDbEntry(hostId))之后關閉對話框而不是調用this.serviceC.runRetry(hostId))

Answer 1

使用 Observable

您可以使用forkJoin和switchMap的操作Rxjs 。

檢查forkjoin 文檔以及

檢查switchMap文檔

通過使用運算符，您可以像這樣重寫代碼

forkJoin(this.hostName.slice(0, this.Id.length).map(hostName => {
  return this.serviceA.Status(hostName).pipe(
    switchMap(hostId => this.serviceB.createDbEntry(hostId).pipe(map((dbEntry) => ({dbEntry, hostId})))),
    switchMap(resp => this.serviceC.runEntry(resp.hostId))
  )
})).subscribe(() => this.dialog.close());

使用 Promise

Promise.all(this.hostName.slice(0, this.Id.length).map(hostName => 
      this.serviceA.Status(hostName)
      .then(hostId => this.serviceB.createDbEntry(hostId).then(() => hostId))
      .then(hostId => this.serviceC.runEntry(hostId))
      )).then(() => this.dialog.close())